Сhewing activity as an indicator of cows heat
DOI:
https://doi.org/10.31548/dopovidi2019.01.023Keywords:
cows, chewing process, chewing activity, cow’s heatAbstract
Ruminant animals, including cattle, capturing food, swallow it, almost without chewing. Changes in chewing activity are the earliest signal that can be considered as a warning about the potential problems of the functional state and health of cows. The course of chewing process is one of the main indicators of the optimality of the physiological state of the cow. In the daily budget, chewing activity ranks second at its expense and is 8-10 hours. Deviations from the above norms can serve as a signal about problems in feeding, maintenance or veterinary.
The research was carried out on cows of Ukrainian black-and-white milk breed whose productivity reached 6000-8000, and in the best animals - 9500-9700 kg of milk with a fat content – 3,6-3,8% and protein – 3,1-3,3%. For research, only healthy cows with a health index (according to the Milcon program) to be at least 88, were selected.
Reactions to the behavior of cows associated with the implementation of their sexual function, can be attributed to the factors that most actively affect other manifestations of their livelihoods. In the state of heat, cows demonstrate a significant and obvious increase in total movement activity, which is now widely used as an indicator of heat in majority electronic systems designed to determine the optimal time for fertilization.
By analyzing the intensity of the chewing process against the background of the motor activity curve in cows with typical heat, elongated heat and silent heat, it can be concluded that the period of sexual excitement of cows is also characterized by significant changes in chewing activity. Thus, we can assume that the dynamics of chewing activity can be successfully used as the main or auxiliary factor in the onset of cow heat.
At the same time, the character of chewing activity changes can be even more effective as a tools of heat detection, in comparison with movement activity, since, as evidence of the study result, "silent" manifestation is not a characteristic for the decline of chewing activity.References
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